Slide-valve gate for paper-pulp digesters



No Model.)

I J. SAUNDERSI" Slide Valve Gates for Paper Pulp Digesters, 8x0.

No. 234,431. Patented Nov. 16,1880.

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JOHN SAUNDERS, OF MANAYUNK, PHILADELPHIA, ASSIGNOR OF ONE-HALF TOFRANCIS JOSEPH OBERT, OF READING, PENNSYLVANIA.

SLIDE-VALVE GATE FOR PAPER-PULP DIGESTERS, 80c.

SPECIFICATION forming part of Letters Patent No. 234,431, dated November16, 1880.

Application filed June 9, 1880.

T all whom it may concern:

Be it known that I, JOHN SAUNDERS, of Mauayunk, in the city and countyof Philadelphia, State of Pennsylvania, have invented a new and usefulImprovement in the (Jonstruction of Slide-Valve Gates forPulp-Digesters, and for vessels to contain oils, acids, or alkalieswhere a perfectly tight valve is required under any pressure, of whichthe fol- 1o lowing is a specification.

This improvement relates more particularly to valves working in a thick,viscous, and fibrous fluid, where it is necessary that the valve shouldat all times be kept in contact 1 with the face.

Various styles of valves have been used for the purpose of emptyingpaper-pulp tanks or digesters, coal-oil, acid, or alkaline tanks; but upto this time there has been no valve giving satisfaction, as they allwould clog or leak; and when this occurred it was necessary to take thevalve apart, clear it of obstructions, or refit it before replacing theparts. This not only occupied time, but cost money to do, be-

2 sides throwing the machinery out of use while the clearing orrefitting of the valve was going on. By my arrangement of valve all thisannoyance is stopped.

Referring to the drawings, in which similar 0 letters refer to similarparts, Figure l is a perspective view of the valve-case and itsaccessories. Fig. 2 is alon gitudinal sectional elevation. Fig. 3 is across-section through the center of the valve and case, also aperspective view of the valve, rod, and loose collar.

A represents the case; A, the cap; B, the branch to the case; B, thebranch on the cap; (J, a bracket-arm for carrying the valve-rod screw D,a wrought-iron yoke to retain the wedges in adjustment; E,stuffing-boxes and glands to prevent blowing and leakage; F, enlargementof the valve-rod for screw-thread; G, nut formed by the head of thebracket 5 H, hand-wheel for moving the valve; J, screwed 4 5 tangsforged on the lower wedges or inclines,

K, jam-nuts securing the wedges after adj ustment to the yoke, L, upperwedge, on the back ofwhich the valve slides 5 M, lower wedge, restingupon the inner face of the case; N,

valve provided with ears 1? P and loose collar P. The fore and aft endsof the valve are (No model.)

formed at an acute angle, so that in its travel over the opening toclose the same it shall,

in conjunction with the edge of the opening, act as a shear, cutting offany fibrous matter 5 5 which it may intercept, thus keeping the faceclear.

The wedges L and M are so arranged that when the incline faces areplaced together their backs shall be parallel with relation to thevalve-face and each other. The upper wedge is made slightly longer thanthe inside of the case, (the case being rabbeted at the ends to formpockets for the wedges,) and is free to move vertically. The lowerwedge, M, has a tang formed at its smaller end, the body of the wedgebeing about one-third less in length than the inside of the case, thetang J beingprojected through the case, and made of such length thatwhen the butt of the wedge is placed against the inside of the caseopposite to the tang stuffing-box it shall project through thewrought-iron yoke D. The outer end of the tan g is screw-threaded fromits end to the stuffing-box gland, and is provided with dou- 7 ble nutsK K, one each side of the yoke. These nuts are for the easy adjustmentof the valve to the face, so that while kept tight it shall still workfreely thereon.

The valve having been placed in the case, (while resting upon the branchflange 13,) the wedges L are laid upon it at the sides. The wedges M arethen putin placeupon the wedges L, inclined faces together, with thescrewed fangs projectingthrough thecase. The bracket-arm 0 being inplace, the threaded valverod F is screwed into the nut G, and with theplain part of the rod into and through the stairing-box in the caseuntil the valve N is reached. The collar P is then placed between theears P, 0 and the valve-rod passed through the ears and collar, beingsecured in the latter by a pin or key. This permits the revolution ofthe screw and the progression of the valve in either direction upon thevalve-face. The cap A is now 5 bolted upon the case A with its face orplaned ledges on the same in contact with the back or the wedges M, thusbinding the valve N tightly against the valve-face. As wear occurs be-.tween the two surfaces the inside nuts K are slackened and the outsidenuts K tightened. This draws the faces together. The inside nuts areagain tightened, and the valve is ready for operating.

If deemed necessary for special cases, the valve-face may be faced withcast-steel and the valve be cast of or be faced with the same inaterial, when it can be closed and kept tight, although passing viscousfluids interspersed with woody fibers.

I am aware that wedges for the purpose of securing a tight fit betweenthe valve and its face are not new, (see patent of WV. Glass, November8, 1870, No. 109,001, stopcock;) but in all the cases coming under mynotice the wedges are brought into action just as the valve closes theopening. This does very well for limpid fluids, but will not do whereviscous or fibrous fluids are to be passed.

Having shown the construction and described the use of my invention,what 1 claim, and for which I desire to obtain Letters Patent of theUnited States, is as follows, to wit:

1. The combination of the slide-valve N with the valve-casin gA, plainwedges L, and tan ged Wedges M, substantially as specified, and for thepurpose described.

2. In combination, the wedges L and M, with the slide-"alve N, case A,yoke D, and nuts K K, substantially as shown, and for the purposespecified.

3. In combination, the yoke D and case A, with tan ged wedges M and nutsK, for the purpose described.

4. In combination, the enlarged valve-rod F, with hand-wheel H,bracket-arm nut G, case A, valve N, and collar 1?, for the purposespecified.

5. The valve N, with its advancing ends beveled to form a cutting-edge,in combination with the inner edges of the opening covered by the valve,for the purpose described, and substantially as shown.

JOHN SAUNDERS.

Witnesses ALFRED SNYDER, R0121. I. BARR.

